Android RecyclerView-滚动更改项 [英] Android RecyclerView - scrolling changes items

问题描述

我有一个带有线性布局管理器的recyclerview，它包含不同的项目.其中一个项目具有隐藏或显示此项目的嵌套布局的按钮.

因此，我添加了类似特定类型的10行的内容，当我单击特定项目时，将显示它的嵌套布局，但是我看到另一个项目显示了它自己的嵌套布局.第二种尝试是单击某些按钮并滚动，嵌套布局显示在其他项目上.

从代码中可以看到，我尝试调用方法-notifyDataSetChanged()，但是它没有帮助.我知道这里有扩展的回收站视图，但就我而言，我想在不更改整个代码的情况下解决它.

布局:

 < RelativeLayoutandroid:layout_height ="wrap_content"android:layout_width ="wrap_content">< TextViewandroid:id ="@ + id/tv"android:layout_height ="wrap_content"android:layout_width ="wrap_content"android:text =单击按钮"/><按钮android:id ="@ + id/btn"android:layout_width ="wrap_content"android:layout_height ="wrap_content"android:text =点击我"android:layout_toRightOf ="@ + id/tv"/>< RelativeLayoutandroid:id ="@ + id/嵌套"android:layout_width ="wrap_content"android:layout_height ="wrap_content"android:layout_below ="@ + id/tv"android:visibility ="gone">< TextViewandroid:id ="@ + id/tv1"android:layout_height ="wrap_content"android:layout_width ="wrap_content"android:text =单击按钮"/></RelativeLayout></RelativeLayout> 

适配器中的代码(onBind)

  @Overridepublic void onBindViewHolder(RecyclerView.ViewHolder持有人，最终的int位置){int类型= getItemViewType(位置);ViewType viewType = ViewType.values()[type];尝试{开关(viewType){案例VIEW1://视图1的代码休息;案例VIEW2:最终的ViewHolder viewHolder =(ViewHolder)持有人；viewHolder.tv.setText("TV1");viewHolder.btn.setOnClickListener(new View.OnClickListener(){@Override公共无效的onClick(View v){viewHolder.nestedLayout.setVisibility(！isVisible?View.VISIBLE:View.GONE);viewHolder.isVisible =！viewHolder.isVisible;//notifyDataSetChanged();}});休息;}}捕获(异常e){e.printStackTrace();Log.d("ChatListAdapter"，聊天列表适配器ioexception" + e.getMessage());}} 

解决方案

如Samuel Robert所指出的，您需要跟踪模型类中扩展项目的可见性:

假设您使用的是模型类项目，则在其中有一个字段来跟踪嵌套布局的可见性.

尝试一下:

  Item item = itemList.get(position);最终的ViewHolder viewHolder =(ViewHolder)持有人；viewHolder.tv.setText("TV1");viewHolder.nestedLayout.setVisibility(！item.isVisible?View.VISIBLE:View.GONE);viewHolder.btn.setOnClickListener(new View.OnClickListener(){@Override公共无效的onClick(View v){int position = getAdapterPosition();if(position！= RecyclerView.NO_POSITION){项目item = itemList.get(位置)item.isVisible =！item.isVisible;notifyItemChanged(position);}}}); 

I have a recyclerview with linear layout manager and it contains different items. one of the items have a button that hides or display the nested layout of this items.

So I added something like 10 rows of the specific type, and when I click on specific item, it's nested layout is displayed, but I see that another item display it's own nested layout. Second try was to click on some button and scrolling, the nested layout was shown on a different items.

As you can see from the code, I tried to call the method - notifyDataSetChanged(), but it doesn't help. I know that there is expanded recycler view, but In my case I want to solve it without change the whole code..

The layout:

<RelativeLayout 
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
>
    <TextView 
        android:id = "@+id/tv"
        android:layout_height="wrap_content"
        android:layout_width = "wrap_content"
        android:text = "click on the button"
    />
    <Button 
        android:id = "@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click Me"
        android:layout_toRightOf="@+id/tv"
    />

    <RelativeLayout
        android:id = "@+id/nested"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tv"
        android:visibility="gone"
    >

        <TextView 
           android:id = "@+id/tv1"
           android:layout_height="wrap_content"
           android:layout_width = "wrap_content"
           android:text = "click on the button"
       />   
    </RelativeLayout>
</RelativeLayout>

The code in the adapter (onBind)

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position)
    {
        int type = getItemViewType(position);
        ViewType viewType = ViewType.values()[type];
        try
        {
            switch (viewType)
            {
                case VIEW1:
                  // code for view 1
                break;
                case VIEW2:

                    final ViewHolder viewHolder = (ViewHolder) holder;

                    viewHolder.tv.setText("TV1");
                    viewHolder.btn.setOnClickListener(new View.OnClickListener()
                    {
                        @Override
                        public void onClick(View v)
                        {

                            viewHolder.nestedLayout.setVisibility(!isVisible ? View.VISIBLE : View.GONE );
                            viewHolder.isVisible = !viewHolder.isVisible;

                            // notifyDataSetChanged();
                        }
                    });


                break;

            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
            Log.d("ChatListAdapter","chat list adapter ioexception" + e.getMessage());
        }
    }

解决方案

As pointed out by Samuel Robert, you need to track the expanded items visibility in your model class :

Say you are using a model class item, have a field inside it to track the visibility of nested layout.

Try this out :

Item item = itemList.get(position);
final ViewHolder viewHolder = (ViewHolder) holder;
viewHolder.tv.setText("TV1");
viewHolder.nestedLayout.setVisibility(!item.isVisible ? View.VISIBLE : View.GONE );
viewHolder.btn.setOnClickListener(new View.OnClickListener()
    {
       @Override
       public void onClick(View v)
       {
        int position = getAdapterPosition();
        if( position != RecyclerView.NO_POSITION ) {
          Item item = itemList.get(position)
          item.isVisible = !item.isVisible;
          notifyItemChanged(position);
        }
       }
     });

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